Mark the correct alternative in the following:

tan 3A – tan 2A – tan A is equal to

Mark the correct alternative in the following:

If 3 sin x + 4 cos x = 5, then 4 sin x – 3 cos x =

Mark the correct alternative in the following:

If in a ∆ABC, tan A + tan B + tan C = 6, then cot A cot B cot C =

Mark the correct alternative in the following:

If then is equal to

Mark the correct alternative in the following:

If and where P and Q both are acute angles. Then, the value of P – Q is